Steps to reproduce:

1. Open attached project
2. Open scene "MainScene"
3. Run it
4. Click "Change Long Text" button and notice that text inside input field is changed
5. Click on input field for caret to appear
6. Using right arrow key, move caret until it leaves visible input field's area. Notice that input field is resized

Additional steps:
7. Stop and run scene again
8. Click "Change Short Text" - text changes
9. Click "Change Long Text" - notice that this time input field is instantly resized, no need to manipulate caret

Reproduced with: 5.3.4p6, 5.4.0b18
5.2 had some null ref exceptions, couldn't test